Non-Newtonian granular fluids: Simulation and theory

Meheboob Alam; S. Luding

Non-Newtonian granular fluids: Simulation and theory

Meheboob Alam, S. Luding

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

Rheological properties of granular fluids are probed via event-driven simulations of the inelastic hard-sphere model. We find that granular fluids support large normal stress differences for the whole range of densities, clearly indicating their non-Newtonian rheology. Interestingly, both first (N ₁) and second (N ₂) normal stress differences undergo sign-reversals with density. While N ₁ changes its sign in the dense limit, N ₂ changes its sign in the dilute limit. The origin of such sign-reversals is tied to the microstructural reorganization of particles and to anisotropy in general. We briefly outline a viscoelastic constitutive model for granular fluids which allows the sign-reversals of both first and second normal stress differences.

Original language	English
Title of host publication	Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media
Pages	1141-1145
Number of pages	5
Publication status	Published - 1 Dec 2005
Externally published	Yes
Event	5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005 - Stuttgart, Germany Duration: 18 Jul 2005 → 22 Jul 2005

Conference

Conference	5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005
Abbreviated title	PG 2005
Country	Germany
City	Stuttgart
Period	18/07/05 → 22/07/05

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title = "Non-Newtonian granular fluids: Simulation and theory",

abstract = "Rheological properties of granular fluids are probed via event-driven simulations of the inelastic hard-sphere model. We find that granular fluids support large normal stress differences for the whole range of densities, clearly indicating their non-Newtonian rheology. Interestingly, both first (N 1) and second (N 2) normal stress differences undergo sign-reversals with density. While N 1 changes its sign in the dense limit, N 2 changes its sign in the dilute limit. The origin of such sign-reversals is tied to the microstructural reorganization of particles and to anisotropy in general. We briefly outline a viscoelastic constitutive model for granular fluids which allows the sign-reversals of both first and second normal stress differences.",

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T2 - 5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005

AU - Alam, Meheboob

AU - Luding, S.

PY - 2005/12/1

Y1 - 2005/12/1

N2 - Rheological properties of granular fluids are probed via event-driven simulations of the inelastic hard-sphere model. We find that granular fluids support large normal stress differences for the whole range of densities, clearly indicating their non-Newtonian rheology. Interestingly, both first (N 1) and second (N 2) normal stress differences undergo sign-reversals with density. While N 1 changes its sign in the dense limit, N 2 changes its sign in the dilute limit. The origin of such sign-reversals is tied to the microstructural reorganization of particles and to anisotropy in general. We briefly outline a viscoelastic constitutive model for granular fluids which allows the sign-reversals of both first and second normal stress differences.

AB - Rheological properties of granular fluids are probed via event-driven simulations of the inelastic hard-sphere model. We find that granular fluids support large normal stress differences for the whole range of densities, clearly indicating their non-Newtonian rheology. Interestingly, both first (N 1) and second (N 2) normal stress differences undergo sign-reversals with density. While N 1 changes its sign in the dense limit, N 2 changes its sign in the dilute limit. The origin of such sign-reversals is tied to the microstructural reorganization of particles and to anisotropy in general. We briefly outline a viscoelastic constitutive model for granular fluids which allows the sign-reversals of both first and second normal stress differences.

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M3 - Conference contribution

AN - SCOPUS:84857603909

SN - 9780415383479

SP - 1141

EP - 1145

BT - Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media

Y2 - 18 July 2005 through 22 July 2005

ER -

Non-Newtonian granular fluids: Simulation and theory

Abstract

Conference

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